Furnace for heat treatment.



A. SMALLWOOD. FURNACE Foa HEAT REATMENT. APPLICATION FILED SEPT. 19. 1916.

Patented Jan. 7,1919.

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srnrns PATENT sermon.

ALFRED sMnLLWoozo. oaLoNDoN, ENGLNJD;

FURNACE FOR HEAT TREATMENT.

i' Specication of Letters Patent.

- Patented aan. 7.19m.

Application led September 19, 1916. Serial No. 121,075.

To all whom it may concern:

Be it known that I, ALFRED SMALLwooD,

a subject of the Kingdom of Great Britain,

residing at 42 Hargrave Park, Highgate, London, N., in the county of Middlesex,

England, have invented certain new and such relationship to the heating chamber as to permit of the goods being removed from the heatingchamber into the oil or other bath without being exposed to. the atmosphere during such removal.

The oil or other bath may be adapted to be moved laterally and when in position/for receiving the goods from theheating chamber sealing means are provided .for sealing the means of communication with the oil or other bath from the atmosphere.

Tn order that this invention may be clearly understood and readily carried into practice, reference may be had 'to4 the appended wh1ch:- l

The figure is a sectional elevation of my invention.

According to my invention T providedfr a furnace with a vertically disposedfhleating" chamber, the bottom of which is closed by a bung adapted to be vremoved in such a manner as to permit of the goods being lowered from the heating 'chamber intoj an oil or other bath, as for instance for. tempering purposes.

The bung is -adapted to be readily removable and is conveniently ofa character sumciently substantial to take the weight of the goods, which latter are advantageously susu ave to rest upon the bung.

With this object in View the bung r may be carried by -a truck s adapted to be moved laterally or horizontally onrailst.

The rails t are adapted to be raised and lowered, as for instance by'being mounted with links u, u to be displaced by a parallel motion, the links being operated in any suitable manner, as for instance by a worm v pended in the heating chamber, but may explanatory sheetsy of drawings, upon engaging with a quadrant lw fixed coaxially with one of the links u.

Between the bung r and the lower vextremity of the heating chamber, a sand or other seal is incorporated, and in separating the bung from the heating chamber it is rstmecessary to lower the bung to withdraw the latter'from the lowerpart of the heating chamber and also to separate the sand or other seal, after which the carriage s carrying the bung is disposed laterally along therails t by any approved mechanism. Guides .a are provided to maintain the bung r and carriage s yin central Y nrelationship to the Yheating chamber a during its vertical displacemennby virtue of their engaging any suitable fixed member. Below the level at which the carriage works a tank 2 is incorporated, so that after the removal of the bung by the carriage, the goods contained in the heating chamber can be lowered into the tank, which may, for instance, contain \oil.' The bung operating -mechanism is contained in a space which is sealed from the atmosphere, and the opening in this space permitting of access to the tank is adapted to be sealed. `For this purpose a sealing member 3 in the nature of.` a cylinder having near its upper edge one portion 4 of an annular sealing device adapted to coperate with the other portion 5 of such sealing device provided around the outlet .oering access tothe tank2, is adapted to be lowered into the tank in such a manner that when the sealing parts 4, 5, are in coperation, the lower part ofthe cylinder 3 dips below the surface of liquid in the tank, and thereby effectively closes the space containing the bung operatin mechanismY from the space containing t e tank and thereforeA from the atmosphere, while permitting of accessto the contents of the tank.

The' tank is contained in a pit-and is adapted to be moved laterally, as for instance by being provided with antifriction members` adapted tov work upon runners. Two or more tanks may be provided in the pit,A for alternative use, andlateral displacement of the tank or tanks is permitted by the cylindrical sealing member 3, which may be raisedclear of the upper surface or edge of the tank 2 to permit of the lateral displacement ofthe latter. Suitable guiding means 7 are provided for guidingthe sealing member 3 in its vertical movements,

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and such movements" may be imparted to y said sealing member 3 by any suitable mechcooling It wil of course be understood that when` anisnnsuch as a cord 8 earned .around suitthe bung is removed from under the article',

the .latter is supported by a crane by means of a suitable holding device passing into the top of the furnace chamber. It is by this means that the article is lowered into the oil bath.

What I claim as m invention and desire to secure by Letters Iatent is A furnace, having a vertically disposed elongated heating chamber, a bung for the lower extremity thereof, mechanism for closing and unclosing said bung or closure member, said mechanism being contained within .an inclosed space, an oil or other bath disposed below said space, and means for sealing the opening offering communication with the oil or other bath.

In -Witness whereof I have hereunto set my hand.

ALFRED SMALLWO OD. 

